Refrigeration apparatus



May 7; 1957 I D. ARdNsoN 2,791,105

REFRIGERATION APPARATUS 4 Shets-Sheet 1 Filed Aug. 24, 1955 IB )0 y DAVID ARONSON- INVENTOR.

D. ARONSON REFRIGERATION APPARATUS May 7, 1957 Filed Aug. 24, 1555 4 Sheets-Sheet 2 DAVID ARON-SON I INVENTOR. By M AL. M

D. ARO NSON REFRIGERATION APPARATUS May 7, 1957 4 Sheets-Sheet 3 Filed Au 24, 1955 DAVID ARONSON IN VEN TOR,

FIG. I:

, May 7, 1957 D. ARON 50 N REFRIGERATION APPARATUS 4 Sheets-Sheet 4 Filed Aug. 24, 1955' DAVID ARONSON IN VEN TOR FIG. l3

United States Patent REFRIGERATION APPARATUS David Aronson, Bloomfield, N. J., assignor to Worthington Corporation, Harrison, N. J., a corporation of Deloware Application August 24,1955, Serial No. 530,388

20 Claims. (Cl. 62-115) The present invention relates to a refrigeration system and more particularly to a compression system using a liquefiable fluid which removes heat from another medium used directly in a cooling system.

In accordance with the present invention, a hermetically sealed compressor is provided to compress a liquefiable fluid, for example, a hydrocarbon, sulfur dioxide, or Freon. The high pressure gas or vapor is discharged therefrom into a condenser having a plurality of tubes therein. A cooling fluid is passed through the tubes in heat exchange relationship with the compressed gas flowing around the outside of the tubes to remove heat therefrom and thus condense or liquefy the gas. The liquefied gas is thereafter passed from the condenser through expansion means wherein its pressure is greatly reduced and causes a portion of the liquid to evaporate. The liquid-vapor mixture is then passed into an evaporator provided with :a plurality of tubes therein. The vapor flows to a compressor, and the liquid flows around the tubes through which a heated fluid is passed. Heat is abstracted from the fluid in the tubes and causes boiling of the refrigerant fluid on the outside of the tubes. The cooled fluid inside the tubes is thereafter passed to the apparatus (not shown) requiring cooling and is again returned in a heated condition to the evaporator for subsequent cooling. The gas formed by the boiling refrigerant fluid is passed through conduit means, along with the gas formed by the flashing of the high pressure fluid, back to the compressor and the cycle is repeated.

The present invention provides a compact compression refrigeration system wherein the condenser and evaporator are disposed in one vessel or container therein providing a compact unit for an indirect expansion refrigeration system which reduces the space requirements for the apparatus and cost of manufacture thereof.

The present invention further provides a compact refrigeration system for cooling water used as the cooling medium in a central air conditioning system.

The present invention also provides a compression refrigeration system having a condenser and evaporator combined in a single unit to provide a package refrigeration system which may be assembled at the point of manufacture and shipped to the point of use without requiring extensive field assemblage or erection.

The invention will be better understood from the following description when considered in connection with the accompanying drawings forming a part thereof and in which Figure 1 is a side elevation partly broken away of a compression refrigeration system embodying the present invention.

Figure 2 is an end view of the apparatus shown in Figure 1.

Figure 3 is an enlarged section taken on line 33 of Figure 1.

Figure 4 is a section on a smaller scale taken on line 44 of Figure 3.

M 2,791,105 Patented May. 7, 1957 Figure 5 is a detailed view taken on line 5-5 of Figure 4.

Figure 6 is a side elevation partly broken away showing another embodiment of the invention illustrated in Figure 1.

Figure 7 is an enlarged section taken on line 7-7 of Figure 6, with a portion broken away to show the expansion means embodied in the apparatus.

Figure 8 is a side elevation partly broken away of still another form of the invention shown in Figure 1.

Figure 9 is an enlarged end elevation partly broken away of the embodiment of the invention shown in Figure 8.

Figure 10 is a side elevation partly broken away of yet another form of the invention shown in Figure 1.

Figure 11 is an enlarged end elevation partly broken away of the embodiment of the invention shown in Figure 10.

Figure 12 is a side elevation partly broken away of another embodiment of the invention shown in Figure 1, and

Figure 13 is an enlarged end elevation partly broken away of the invention shown in Figure 12.

Referring to the embodiment of the invention shown in Figures 1 to 5 of the drawings, the reference numeral 10 designates a refrigeration apparatus comprising a condenser evaporator unit 11 and a compressor unit 12. The condenser evaporator unit is formed by a substantially cylindrical shell or casing 13 in which is disposed a condenser 14 in the upper portion thereof and an evaporator 15 in the lower portion thereof.

Condenser 14 comprises a plurality of tubes 16 disposed within a substantially cylindrical casing 17 joined to the opposite end walls of shell 13 in a fluid-tight relationship. The opposite ends of tubes 16 are disposed in a fluid-tight relationship in tube sheets and communicate with water boxes 18 and 19 positioned adjacent the opposite ends of shell 13. Water box 19 is provided with a partition 20 therein to form inlet and outlet chambers 21 and 22 having inlet and outlet connections 23 and 24 respectively in communication therewith for passing cooling water through the tubes in heat exchange relationship with refrigerant fluid passed around the outside of the tubes to condense or liquefy said fluid. A semi-circular shaped baffle 25 (Fig. 3) having its upper and lower edges in contact with casing 17 extends longitudinally of the condenser a short distance to form a passageway 26 adjacent the inlet opening 27 of the condenser for uniformly distributing the refrigerant fluid passing into the condenser around the tubes therein.

Evaporator 15 comprises a plurality of tubes 29 forming a laterally extending tube bundle in the lower portion of shell 13. Tube bundle 29 is disposed over an outlet opening 30 in the bottom of casing 13 and is in spaced relationship with condenser 14. The opposite ends of tubes 29 are disposed in tube sheets and communicate with water boxes 32 and 33 provided adjacent the opposite ends of shell 13. Box 33 is provided with a vertical partition 34 (Fig. 2) dividing the box into inlet and outlet chambers having inlet and outlet connections 35 and 36 respectively in communication therewith for passing heated water through the evaporator tubes in heat exchange relationship with refrigerant fluid which is reevaporated to remove the latent heat therefrom to cool the water.

The compressor unit 12 comprises a hermetically sealed cylindrical drum 12, in which is disposed a compressor and motor, not shown, for compressing the liquefiable refrigerant used in the system.

Compressed refrigerant gas is passed to the condenser compressor unit at one end and in communication with 3 inlet opening 27 at the opposite end thereof. The refrigerant gas, after being liquefied in the condenser is passed therefrom through .conduit 38 connected at one end to the bottom of the condenser and at the other end to an expansion valve 39. i t I Expansion valve 39 comprisesa substantially vertical casing 40 disposed in shell 13 adjacent condenser 14. A removable cover plate 39a provides access to the valve. Valve 39 is provided with a floatchamber 41 in the upper portion thereof in communication with conduit 38 and a discharge chamber 42 in the lower portion thereof in communication with a plurality of spray nozzles 43.

through U-shaped pipe connection 43a. A float valve 44 disposed in chamber 41 operatesas an expansionvalve to permit the condensed refrigerant to expand and a portion of it to vaporize as it passes through valve opening 45 into discharge chamber 42.

A vapor discharge conduit 47 in communication with evaporator outlet opening 30 at one end thereofand in communication with the suction side of the compressor a unit 12 permits the passage of re-evaporated refrigerant fluid from evaporator to the compressor, not shown. A control valve 48 is disposed in conduit 47 for controlling the flow of vapor to the compressor.

In operation, cooling water is passed through condenser 14 through inlet connection 23 therein from a source not shown and is discharged therefrom through outlet 24. Heated water is passed through evaporator 15 through inlet connection 35 therein from a central air conditioning or refrigeration system, not shown, and is discharged therefrom through outlet connection 36 and returned to said refrigeration system. The compressor, not shown, in drum 12 is then placed in operation to compress the refrigerant fluid and discharges high pressure refrigerant gas through conduit 37 into condenser 14. The refrigerant gas passes through inlet opening 27 and impinges against baflle therein, thereafter flowing around the opposite ends of the battle and passing uniformly around condenser tubes 16 in heat exchange relationship with the cooling water flowing inside the tubes. The cooling water extracts heat from the refrigerant gas and causes it to liquefy or condense. Thereafter, the liquefied refrigerant is discharged from the condenser through conduit 38 and flows into float chamber 41 of expansion valve 39. Float valve 44 controls the flow of refrigerant through valve opening 45 into discharge chamber 42 and throttles the pressure of the liquid refrigerant from the higb pressure in the condenser and float chamber 41 to the low pressure in discharge chamber 42, pipe connection 43a, nozzles 43, and the evaporator 15. In passing through valve opening 45, the volume of the refrigerant liquid increases .or expands and a portion of the liquid is converted or reevaporated into a gas. The liquid-gas mixture thereafter flows through pipe connection 43a and is distributed through nozzles 43 around the outside of evaporator tubes 29 and is vaporized. The heated water flowing inside tubes 29 passes in heat exchange relationship with the vaporized mixture and the mixture extracts the latent heat of vaporization from the water thereby cooling the water. The cooled water is then discharged from the evaporator through outlet connection 36 to the refrigeration system, not shown.

The re-evaporated refrigerant gas thereafter flows from the evaporator through outlet opening and conduit 47 to the suction side of the compressor unit. Thereafter,- the compression, condensation, and throttling steps of the cycle are again repeated. Thus, the present invention provides a compact refrigeration system wherein the condenser and evaporator incorporated therein are disposed within the same casing thereby reducing the space requirements for the system and decreasing the cost of the manufacture. In addition, the present compact refrigeration apparatus permits the unit to be assembled at the place of manufacture so that it may be shipped to the point of use without requiring extensive assembly in the .fields.

The embodiment of the invention shown in Figures 6 and 7 substantially the same as that in Figures 1 to 5 except that the condenser 50 is located in the lower portion of the condenser evaporator unit with the lower portion of condenser 50 projecting below or outwardly of shell 13. Refrigerant conduit 51 in communication with the discharge side of the compressor unit is connected to the portion of condenser 50 projecting outwardly of shell 13. A small vent 51a in the upper portion of the float chamber 41 permits the escape of gas into the low pressure side so that the pressure will be intermediate between that of the condenser and evaporator. Also, the evaporator 52 in this embodiment is disposed in the upper portion of casing 13 and is provided with a curved baffle 53 below the evaporator tube bundle extending from one side of casing 13 to a point in spaced relationship with the other side thereof. A vertically inclined battle 54 is fixed to the end of baffle 53 to provide a compartment 55 in the tube bundle for the liquid-gas refrigerant mixture. A conduit 57 is connected at one end to discharge chamber 42 of expansion valve 39 and at the other end to an inlet opening 58 in bathe 53 for discharging refrigerant to compartment 55 of the evaporator.

The operation of the invention is substantially the same as that in Figures 1 to 5, except that the liquefied refrigerant is discharged from the expansion valve into compartment 55 formed therein. The vaporized refrigerant after passing in heat exchange relationship with the portion of the tubes in compartment 55 passes over the upper edge of baifle 54 and passes in heat exchange relationship with the remaining portion of the tubes adjacent compartment 55. Any unvaporizcd liquid carried as entrained droplets in the vapor stream will be vaporized as they pass over the portion of evaporator tubes adjacent compartment 55. Thereafter, the gas flows down- Wardly into the lower portion of casing 13 and is discharged through conduit 47 to the suction side of the compressor unit.

The invention shown in Figures 8 and 9 is substantially the same as that shown in Figures 6 and 7 except that the condenser 60 is disposed substantially within the lower portion of casing 13. Conduit 61, in communication with the discharge side of the compressor unit, is provided with a diffuser and distributor 62 disposed adjacent the lower portion of the condenser. The conduit 65 in communication with the expansion valve extends into condenser 60 along the inner periphery of the condenser shell and is provided with an inlet opening 66 in the bottom thereof adjacent distributor 62.

The operation of this embodiment of the invention is substantially the same as that shown in Figures 6 and 7.

The embodiment of the invention illustrated in Figures 10 andll is similar to that shown in Figures 1 to 5, except that the compressor unit is disposed above the condenser evaporator unit 10 and a strainer compartment 70 having a strainer 7.1 is disposed in the unit. Connccting pipe 72 in communication with strainer compartment 70 is provided with a plurality of nozzles or orifices 73 which act as the expansion valve. The strainer protects the nozzles from the entry of small particles which cause plugging of the nozzle passages.

The form of invention shown in Figures 12 and 13 is substantially the same as that shown in Figures 10 and 11, except that condenser has its upper portion projecting outwardly of shell 13 and conduit 81 in communica tion with the discharge side of the compressor unit has its condenser end connected to a horizontally extending pipe 82 disposed in the upper portion of the condenser. A plurality of spaced vertical sleeves 83 having apertures 84 in the lower portion thereof are connected to pipe 82 for uniformly distributing the refrigerant gas through the condenser tube bundle. I

It will be understood that changes may be made in the form, location, and materials used in the construction of and arrangement of the various parts of. the apparatus disclosed herein'without departing from" the principles of the invention which is not to be limited except by the scope of the appended claims.

What is claimed is:

1. In a refrigeration system, a shell forming a condenser-evaporator unit, a compressor unit for compressing a vaporized refrigerant fluid therein, a cylindrical casing disposed in said shell forming a condenser therein, a cylindrical tube bundle having an inlet and outlet end enclosed by said casing for passing cooling fluid therethrough, said condenser having an inlet opening therein for receiving refrigerant fluid therethrough to be condensed, conduit means in communication with said compressor unit and inlet opening for passing compressed refrigerant fluid therethrough to be condensed, an evaporator disposed in said shell comprising a laterally extending tube bundle having an inlet and outlet end for flowing heated fluid therethrough, said cylindrical tube bundle being positioned within said casing in vertical alignment with and on one sied only of said laterally extending tube bundle, expansion means in communication with said condenser to receive high pressure condensed refrigerant fluid therethrough and in communication with said evapo rator to discharge low pressure refrigerant fluid thereto in heat exchange relationship with said flow path to boil said refrigerant fluid and cool said heated fluid, and other conduit means in communication with the evaporator and compressor unit for flowing the re-evaporated refrigerant fluid therethrough to be compressed in said compressor unit;

2. The apparatus of claim 1 wherein a curved baflle is disposed in the condenser adjacent the tube bundle therein and in spaced relationship with said inlet opening, and said baflle extends longitudinally of the condenser and has its upper and lower ends joined to the inner surface of the condenser casing.

- 3. The apparatus of claim 1 wherein said conduit means is connected to a horizontally extending pipe disposed in the upper portion of the condenser, and vertical sleeves having openings therein are connected to said pipe.

4. The apparatus of claim 1 wherein the expansion means comprises a vertical casing having a float valve therein, said casing disposed in the shell adjacent the condenser.

5. The apparatus of claim 1 wherein the expansion means comprises a conduit having a plurality of nozzles thereon, and a strainer is disposed in the shell in communication with said conduit.

6. The apparatus of claim 1 wherein a diffuser and distributor is disposed in said conduit means adjacent said inlet opening.

7. The apparatus of claim 1 wherein baflie means are disposed in said evaporator tube bundle to form a liquid compartment therein.

8. The apparatus of claim 1 wherein a curved baffle is disposed in the condenser adjacent the tube bundle therein and in spaced relationship With said inlet opening, said baflie extending longitudinally therein with its upper and lower edges joined to the inner surface of the condenser, and baflle means are disposed in the evaporator tube bundle to form a liquid compartment therein.

9. In a refrigeration. system, a substantially cylindrical shell forming a condenser-evaporator unit, a condenser and an evaporator disposed in vertical alignment with one another in said unit, a hermetically sealed compressor unit for compressing a liquefiable refrigerant gas therein, conduit means in communication with said compressor unit to receive compressed gas therefrom and in communication with the condenser for flowing gas therethrough to said condenser, a cylindrical tube bundle disposed in said condenser having an inlet and outlet end for passing cooling water therethrough in heat exchange relationship with said compressed gas to liquefy the gas, expansion means in said condenser-evaporator unit in communication with said condenser to receive high pressure liquefied gas therefrom and in communication with said evaporator to discharge low pressure liquefied gas thereto, a laterally extending tube bundle disposed in said evaporator having an inlet and outlet end for flowing heated water therethrough in heat exchange relationship with the liquefied gas to boil said gas and extract latent heat of vaporization from said water to cool the water, said cylindrical tube bundle being positioned on one side only of said laterally extending tube bundle and other conduit means in communication with the evaporator and said compressor unit for flowing the re-evaporated gas therethrough to be compressed in said compressor unit.

10. In a refrigeration system, a substantially cylindrical shell forming a condenser-evaporator unit, a substantially cylindrical casing extending longitudinally of said shell to form a condenser therein, an evaporator disposed in said shell, said condenser and evaporator positioned in vertical alignment with one another therein, a hermetically sealed compressor unit for compressing a vaporized refrigerant fluid therein, said compressor unit disposed in vertical alignment with the condenser-evaporator unit, conduit means in communication with said compressor unit to receive compressed refrigerant fluid therefrom and in communication with the interior of the condenser for flowing refrigerant fluid therethrough to said condenser, a tube bundle disposed in said condenser having an inlet and outlet end for passing cooling fluid therethrough in heat exchange relationship with said compressed refrigerant fluid to liquefy it, expansion means in said condenserevaporator unit in communication with the interior of said condenser to receive high pressure liquefied refrigerant fluid therefrom and in communication with said evaporator to discharge low pressure liquefied refrigerant fluid thereto, means forming a flow path disposed in said evaporator having an inlet and outlet end for flowing heated fluid therethrough in heat exchange relationship with the liquefied refrigerant fluid to boil said refrigerant fluid and extract latent heat of vaporization from said heated fluid to cool it, said cylindrical casing being positioned adjacent one side only of said evaporator flow path and other conduit means in communication with the evaporator and said compressor unit for flowing the re-evaporated refrigerant fluid therethrough to be compressed in said compressor unit.

11. The apparatus of claim 10 wherein the condenser is positioned in the upper portion of said shell and the evaporator is positioned in the lower portion thereof.

12. The apparatus of claim 10 wherein the condenser is positioned in the lower portion of said shell and the evaporator is positioned in the upper portion thereof.

13. The apparatus of claim 10 wherein the compressor unit is disposed below said condenser-evaporator unit.

14. The apparatus of claim 10 wherein the'compressor unit is positioned above said condenser-evaporator unit.

15. The apparatus of claim 10 wherein a portion of said condenser projects outwardly of said condenser-evaporator shell.

16. In a refrigeration system, a horizontally extending cylindrical shell forming a condenser-evaporator unit, a cylindrical casing disposed in the upper portion of said unit forming a condenser therein, a tube bundle having an inlet and outlet end in said condenser for passing cooling water therethrough, said condenser having an inlet opening therein for receiving gas therethrough to be condensed, a curved baffle disposed in the condenser adjacent said tube bundle and in spaced relationship with said inlet opening, said baflie extending longitudinally of the condenser and having its upper and lower ends joined to the inner surface of the condenser casing, a compressor unit disposed below and in vertical alignment with said condenser-evaporator unit for compressing a liquefiable refrigerant gas therein, a condenser supply 7 conduit connected to said compressor unit and extending through said shell and in communication with said inlet opening to pass gas to be condensed to said condenser, 21 vertical casing disposed in said shell adjacent said condenser, an, expansion valve in said casing, a discharge conduit in communication with the condenser and valve for passing condensed gas therethrough, an evaporator in the lower portion of said condenser-evaporator unit, said evaporator comprising a tube bundle having an inlet and outlet end for passing heated water therethrough, a discharge pipe having a plurality of spray nozzles therein in communication with said valve and evaporator for passing low pressure condensed gas to be boiled to the evaporator, said evaporator having an outlet therein below said tube bundle, and a gas discharge conduit in communication with said outlet and said compressor unit for passing gas therethrough to said compressor unit.

17. In a refrigeration system, a horizontally extending cylindrical shell forming a condenser-evaporator unit, a cylindrical casing forming a condenser in the lower portion of said unit with the lower portion of said condenser extending below said shell, a tube bundle having an inlet and outlet end in said condenser for passing cooling water therethrough, said condenser having an inlet opening in the portion thereof extending outside said shell for receiving gas therethrough to be condensed, a circular bafiie disposed in the condenser adjacent said tube bundle and in spaced relationshipwith said inlet opening, said bafflc extending longitudinally of the condenser and having its upper and lower ends joined to the inner surface of the condenser casing, a compressor unit disposed below and in vertical alignment with said condenser-evaporator unit for compressing a liquefiable refrigerant gas therein, a condenser supply conduit connected to said coinpressor unit and in communication with said inlet opening to pass gas to be condensed to the condenser, a vertical casing disposed in said shell adjacent said condenser, an expansion valve in said casing, a discharge conduit in communication with the portion of said condenser extending outside of the shell and extending through said shell and in communication with said valve for passing condensed gas therethrough, an evaporator in the upper portion of said condenser-evaporator unit, said evaporator comprising a tube bundle having an inlet and outlet for passing heated water therethrough, a circular baffle positioned below the evaporator tube bundle, said baffle joined to one side of the shell and extending transversely of the tube bundle to a point in spaced relationship with the opposite side of said shell, another bafile extending upwardly from the end of said one battle to provide a liquid compartment in said evaporator, a discharge pipe in communication with said valve and said compartment for passing low pressure condensed gas therethrough to said evaporator, said evaporator having an outlet therein disposed below said tube bundle, and a gas discharge coni duit in communication with said outlet and said compressor unit for passing gas therethrough to the compressor unit.

18. In a refrigeration system, a horizontally extending cylindrical shell forming a condenser-evaporator unit, a cylindrical casing forming a condenser in the lower portion of said unit, a tube bundle having an inlet and outlet end in said condenser for passing cooling water therethrough, said condenser having an inlet opening therein for receiving gas therethrough to be condensed, a compressor unit disposed below and in vertical alignment with said condenser-evaporator unit for compressing a liquefiable refrigerant gas therein, a condenser supply conduit connected to said compressor unit and in communication with said inlet opening to pass gas therethrough to said condenser to be condensed therein, a diffuser and distributor in said supply conduit positioned adjacent said inlet opening, a vertical casing disposed in saidshell adjacent said condenser, an expansion valve in said casing, a discharge conduit in communication below the evaporator tube bundle, said battle joined to one side of said shell and extending transversely of the tube bundle to a point in spaced relationship with the opposite side of said shell, another bafile extending upwardly from the end of said one bafile to provide a liquid compartment in said evaporator, a discharge pipe in com munication with said valve and said compartment for passing low pressurelcondensed gas therethrough to said evaporator, said evaporator having an outlet therein disposed below said tube bundle and a gas discharge conduit in communication with said outlet and said compressor unitfor passing gas therethrough to the compressor unit.

19. In a refrigeration system, a horizontally extending cylindrical shell forming a condenser-evaporator unit, a cylindrical casing disposed in the upper portion of said unit forming a condenser therein, a tube bundle having an inlet and outlet end in said condenser for passing cooling water therethrough, said condenser having an inlet opening therein for receiving gas therethrough to be condensed, a circular batfle disposed in the condenser adjacent said tube bundle and in spaced relationship with said inlet opening, said baffle extending longitudinally of the condenser and having its upper and lower ends joined to the inner surface of the condenser casing, a compressor unit disposed above and in vertical alignment with said condenser-evaporator unit :for compressing a liquefiable refrigerant gas therein, a condenser supply conduit connected to said compressor unit and extending through said shell and in communication with said inlet opening to pass gas to be condensed to said condenser, a strainer unit disposed in said shell adjacent said condenser, a discharge conduit in communication with the condenser and strainer for passing condensed gas therethrough to the strainer, an evaporator comprising a tube bundle having an inlet and outlet end for passing heated water therethrough, a discharge pipe in communication with said strainer at one end and extending into said evaporator above said evaporator tube bundle, a plurality of spray nozzles disposed in said pipe for passing high pressure condensed gas therethrough to the evaporator tube bundle, and a gas discharge conduit in communication with said evaporator and said compressor unit for passing gas therethrough to said compressor unit.

20. In a refrigeration system, a horizontally extending cylindrical shell forming a condenser-evaporator unit, a cylindrical casing disposed in the upper portion of said unit forming a condenser therein with the upper portion of said condenser extending above said shell, a tube bundle having an inlet and an outlet end in said condenser for passing cooling water therethrough, a compressor unit disposed above and in vertical alignment with said condenser-evaporator unit for compressing a liquefiable refrigerant gas therein, a horizontal pipe disposed in the upper portion of said condenser, vertical sleeves connected to said horizontal pipe having apertures in the lower portion thereof, a condenser supply conduit connected to said compressor unit and said horizontal pipe for passing gas therethrough to be condensed, a strainer unit disposed in said shell adjacent said condenser, a discharge conduit in communication with the condenser and strainer for passing condensed gas therethrough to the strainer, an evaporator comprising a tube bundle having an inlet and outlet end for passing heated water therethrough, a discharge pipe in communication with said strainer at one end and extending into said evaporator above said evaporator tube bundle, a plurality of spray nozzles disposed in said pipe for passing high pressure condensed gas therethrough to the evaporator tube bundle, and a gas discharge conduit in communication With said evaporator and said compressor unit for passing gas therethrough to said compressor unit.

References Cited in the file of this patent UNITED STATES PATENTS Carrier Mar. 9, 1926 Arbuckle May 13, 1952. 

